Pulp or paper machine



H. E. TIDMARSH-l PULP 0R PAPER MACHINE. APPucAIioN FILED 020.9. 1919.

1,387,954.. Patented Aug. 16,1921..

5 SHEEiS-SHEET 2.

3 wuentoz atto/mman H. E. TIDIVIARSH.

PULP 0R PAPER MACHINE.

` APPLICATION FILED DEC.9, 1919.

1,387,954. Patentemug. 16,1921.

5 SHEES-SHEET 3- H. E. TIDMARSH.

PULP 0R PAPER MACHINE.

APPLICATION FILED DEC.9, 1919.

Patented Aug. 16, 1921.

5 SHEETS-SHEET 4 M y M @Ittozma E PWM@ Mw@ VM H. E. TIDMARSH.

PULP on PAPER MACHINE'.

APPLICATION FILED DEC. 9. 19|?.

1,387,954, Patented Allg. 16; 1921.

5 SHEETS-SHEET 5- llllllllllllllll Il l Tjliuulllllwwgliluwlll y@Hozmeis v STATES PATENT oFF'lcE.

' HARRY E. TIDMARSH, or BANGOR, MAINE, A'ssIGNoR or ONE-HALF To UNIONIRON WORKS, OF BANGOR, MAINE, A CORPORATION OF IMIAIII'IEP.

:PULP on vParma MACHINE.

Be it known that I, HARRY E. TTDMARSH, a citizen of the United States,residin'of at Bangor, in the county of Penobscot, -tate of Maine, haveinvented certain new and useful Improvements in Pulp or Paper Machines;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertans to make and use the same.

This invention relates to improvements in the ymanufacture of paper andpulp, andl more particularly to improvements in wet machines forconverting pulp into webs and sheets and for removing therefrom thegreater portion of its contained moisture.

In the manufacture of paper pulp into webs and sheets, the firstproblem, after the web has been formed, is to eliminate the water. Inthe manufacture of paper this is accomplished in twodistinct stages. Inthe -irst the water is squeezed out; in the second it is driven out byheat. In the manufacture of pulp where the final product is a sheet onequarter ofy an inch or more in thickness the use of heat isimpracticable and reliance must be placed Von pressure alone. The morewater removed the .greater the percentage of actual pulp in the marketedproduct, which means a saving in transportation charges per unit of drypulp and a reduction in the freight chargespaid for the transportationof water. Clearly then,

the more water pressed from the web the better.

The common practice is .tol pass the newly formed webl between pressurerolls, but because of its tenuity it must be supported upon feltsyduring this squeezing operation. As the pressure exerted by succeedingpairs of rolls increases, a point is lreached where the wear and tear onthe felts becomes prohibitive. This marks the limitof pressure, and thewater content of the marketed pulp `is thus practically determined bythe compression which the felts can successfully withstand.

v when the web is firstformed for it is then mostly all water and mustbe supported as it passes between the pressure rolls. But

by forming Patented Aug. 16, 1921.

this objection does not hold with the same force for the later rolls for-at this point the strength of the web has increased, and theoreticallythere seems no good reason why the web should not be passed between thebare rolls. lIt happens then, thatthe pulp is best able vto passunsupported through the very rolls which exert the greatest pressureand. do most damage to the feltsa happy circumstance. Theoreticallythere seems no good reason why bare rolls should not be used for thefinal pressure; actually it happens that the rolls,

slippery from the water squeezed from the pulp cannot grip the oncomingweb with a grip sufficient to pullf itthrough, and the crushing strengthof the pulp itself is too puny to transmit any push from the felts whichit has quit. Consequently ,the web slips and crushes, piling up in thenip of the rolls and passing through in disordered unconnected patches.This is especially true where the pulp passes through the finall rollsin the form of separate sheets,- each one of which must be individuallygripped by the rolls.

Another problem confronting the manufacturer of pulpl is the one ofdividing the web into, sheets of a size convenient for storage ortransportation. It has heretofore been proposed -to construct machinesfor the manufacture of sheets-of paper and pulp,

the web with weakened transverse port1ons, and subsequently breaking theweb into sheets along the weakened portions thus formed,by subjectingthe web to a sulicient pull or tension, but in such machines there havebeen provided two sets of felts and rolls, one set for carrying the webwhile it is being formed and subjected to pressure, and the other forcarrying the .web while it is being subjected to its breaking operationlAccording. to the present invention, the independent rolls for breakingthe web into sheets and the second series or set of felts for carryingthe web while it is being broken are eliminated; and thepresentinvention provides an improved wet machine for forming the pulp intowebs having weakened portions formed therein, and for removing from theweb thus formed the greater portion of its moisture, so that the web isobtained in a relatively dry state, and, incident to such operations,for breaking the web into sheets along the weakened portions thereof.

In the improved wet machine of the present invention the pulp is formedinto a sheet or web upon a screen cylinder operaty ing in much theusualgmannernbut provided with improved means, hereinafter more fullydescribed, for forming weakened portions in the web lboth transverselyand longitudinally. The 'Web thus formed is conveyed by a felt betweenwringer rolls and thence between two sets of press rolls, between eachset of which the web is subject-` ed to a heavy pressure and convertedinto a relatively dry condition adapted directly for storage andtransportation. The first set of press rolls has both the -felt and theweb passing therethrough, so that the web is subjected to`compression,with accom.- panying removal of water therefrom, while in contact with`the felt. The second, set of press rolls', however, does not have thefelt passingtherethrough, but this set acts di- I lrectly upon the weband effects a further ported, with rods` of relatively large cross-.verted into a series of sheets.

vBeyond the final press. rolls are situated a palr of divergingoff-bearing belts which exert a sufficient transverse pull on `everysheet fed from the rolls to break them along the longitudinal weakenedportions.

The present invention also includes improvements in the cylinder' moldor screen cylinder which rotates in the pulp vat and upon which the webis formed. This cylinder is wound with wire and covered with screenfabric in much the usual way, but it` 1s provided in itsperipheralframework, .upon which the wire and screens are supsection spaced aparta circumferential distance equal to the vlength of the sheets into whichthe web\ is to be broken. These rods are considerably larger thantherelatively ,small rods forming the main circumferential framework of thecylinder and, by reasonrof the1r relatively large cross section, theycause the web'formed upon the cylinder to be weakened along the lineswhere.

`these rods occur, fortle reason that the pulp doesnot build up sorapidly upon the portions of the cylinder outside of these rods: Theother details of construction of the lmproved screen cylinder will bemore fully hereinafter set forth in c0nnection, with the ..mo'redetailed description of the invention.

.the second set of press rolls'; and i The present invention furtherincludes improvements in the construction of-the press rolls themselves;in the delivery mechanism for removing the separated sheets; in doctors;and in other features of construction; all as more fully hereinafterSetl forth and as claimed. 1

The invention will be further described in connection with theaccompanying drawings which illustrate the preferred embodiments thereofand in which- Figures 1 and 2 together constitute an elevation withparts in section of a wet machine constructed in accordance with thepresent invention;

Fig.V 3 is a view'illustrating a modificationf; l

Fig'. 4 shows a modified construction of tFhat` partof the machineillustrated in Fig. 5 is an enlarged top view of part of, the deliverymechanism;

Fig. 6 is an enlarged View showing the construction of a preferredembodiment of `Figs. 7, 8l and 9 are fragmentary views showing theconstruction of the screen cylinder. j Referring to the drawings, 7indicates the pulp vat within which the screen cylinder 8 4is mounted.The pulp within the vat is maintained atthe desired level, in a mannerwhich will be readily understood without illustration, so that thescreen cylinder will be immersed thereinto the desired extent. 100.v.The water passing intothe interior of the cylinder is withdrawntherefrom through one or both of the ends thereof in a manner wellunderstood and therefore not herein illustrated and described. As thecylinder rotates a layerof pulp is' formed thereon, as

indicated at '10 inJFig. 1, the thickness of the layer being regulatedbythe difference in level between the pulp and the water within thecylinder. Arranged above the cylinder is the couch roll 11, carried by apivotally supported part ofthe frame and arranged to bear upon thescreen cylinder. The layer of pulp formed upon the cylinder is broughtinto Contact with the felt 9 as the 115 cylinder rotates and is removed`.from the cylinder by the felt which carries it around ,the couch rolll1 and thence between the 'sets' of rolls referred to below.' f

l' The felt and -web after leaving .the couplr 120 roll l1 pass over theguide roll 12and thence between the three sets of rolls of which thebottom rolls are indicated at 14, 15 and 16 andthe top rolls at 29, 30,31. A second felt passes around therolls 29, 30 and 31 125 and aroundthe roller 32 which is adjustable by means of the rods 33, havinffoperating handles 34. The web is accordingly in contact with both/thelower felt 9, and the upperfelt 28 while it is passing between 130 thesethree sets of rolls. These vrolls serve as wringer rolls and guide rollsand remove a portion of the water from the pulp web. From the roll 16the felt 9 and web pass downwardly to the first set of press rolls 17, v

y 18, between which they are subjected to a heavy pressure, so that alarge portion of the water is. squeezed out4 of the pulp web.

Beyond'the 'first set of press rolls the felt and web pass over theguide roll 194 and the felt then returns around the rolls 20, 21, 22,

23 and 24 to the screen cylinder and couch roll 11, while the web isseparated from the felt and passes downwardly over the table or guide 41to the second set of press rolls 42, 43. The guide roll 22 is verticallyadjustable to permit of taking up slack in the endless felt 9 and ofadjusting its tension. For this purpose the bearings for the roll 22 aremounted upon threaded rods 25 which may be turned from one side` of themachine by a hand wheel 26 on a shaft connected by bevel gears 27 to thethreaded rods 25.

In the modification illustrated in Fig. 3

the upper felt 28 is extended beyond the roll 17 so that the web will becompressed between the two felts as it passes between the rolls 17 and18.

Suitable provision is made for causing the desired pressure to beexerted between the rolls of the different sets, as, for example,

-roll 19, and slides down over the surface of the table 41 to the secondset of press rolls 42, 43. This table is mounted in such a position thatit serves to support the web and to guide it and it is als`o preferablyinclined at Such an angle that the web will readily slide ydown overit.' The lower press roll 43 is mounted in bearings upon the side framesof the machine. The upper press roll 42 is mounted in bearings .formedin supports 44 pivotally mounted upon the side frames of the machine andforced down upon the lower roll by rods 46 connected to weighted ylevers45 and havingy adjustable springs 46.

The rolls 42 and 43, in the embodiment of the invention illustrated inFig. 6. are corrugated so that they will grip the web, and

the separatel sheets into .which the web is broken, and drawthempositively between them. This corrugation, in the embodimentillustrated, takes the form of threads or grooves cut helically in' thecylindrical sur- .faces of the rolls. In order to overcome any possibletendency of the helical grooves to shift the web to one side'of themachine, two sets of symmetrically disposed helical grooves should beemployed. Thus, as illustrated, the grooves begin at the centers of thecylinders and extend toward each end. The depth of the groove, as wellas its pitch, can be varied, and the width of the groove, as well as thewidth of the intermediate cylindrical portions of the roll'can likewisebe Varied. vThese cylindrical portions are shown as'of slightly lessdiameter than the end portions 42a and 43a of the roll, so that, whenthe sheet or web of pulpis not passing between the rolls, they willbears upon each other only at their ends, but so that, when the pulp ispassing between the rolls, they will be forced apart and will then bearonly upon the pulp layer. between the grooved portionsof the roll isless than the thickness of the pulp web which passes between them sothat when the pulp layer is between them, the'rolls will no longer bearupon each other at their ends but will exert the desired pressure uponthe web to bring about the kfurther removal of water. and resultingdrying. T he arrangement ot' the grooves so t-hat` they extend from thecenters to the ends of the rolls has the tur ther advantage of assistingin causing the water squeezed from the web to travel to- That is, thedistance ward the ends of the rolls so that itis more effectivelyremoved.

It will accordingly be seen that there are provided two sets of pressrolls which act successively upon the pulp web and coperate intheremoval of water therefrom, so that the pulp is obtained in arelatively dry state and with but a relatively small amount of waterremaining therein. It will further be seen that the first setofpressrolls acts upon the web while it is still in contact with the felton one or both sides, while the second set of press rolls acts upon `thepulp dii-eetl)v so thatit is subjected to pressure between the hard,smooth surfaces of the rolls instead of between felts.

The second set of press rolls 42. 43. 1s

rotated at a some-what greater peripheral speed than is the first set otpress rolls 17. 18. As a result, the pulp web is broken along theweakened portions thereotl and separated into sheets. so that it is theseparated sheets of the web which pass between the second set of pressrolls and which are there subjected to the further removal of watertherebetween. These pulp sheets are still sufficiently wet so that the;rare slippery, but the corrugated surfaces of the press rolls 42 and 43`nevertheless grip the sheets and draw them positively between the rollswithout Vthe aid of felts.4

Power is applied to the machine in any suitable manner. such as .b vmeans of a pulley 49 mounted on shaft- 50. Upon this shaft is a pinionl51 which meshes with a gear 52 on the shaft of the lower. press roll 18.This gear 52 also meshes with an intermediate gear 53 mounted on a shaft54, and the pinion 53 also meshes with a gear 55 on the shaft of thelower press roll 43. It will thus be noted thatfthe lower press rolls 18.and 43 are directly connected sov that they have'a constant relativerotation. The gear 55 is ,somewhat smaller than the gear 52, while thepress rolls 18 and 43 are of substantially the same size. The peripheralspeed of the roll 43 is accordingly somewhat the table.

greater than that ,of the roll 18. The portion of the web passinbet-Ween the press rolls 42 and 43 is accordlngly caused to move ati aspeed in .excess Aof the speed of movement of the portion passingbetween the rolls 17 and 18. This difference in speed causes the web tobe broken or severed along the weakened transverse lines. The distancebetween the two sets of rolls, and the arrangement of the table 41, arepreferably such that the vbox such as the lbox indicated at 56.

The two sets of press rolls 17, 18 and 42, 43, may havethe rolls of eachset geared together, preferably on the opposite ends of the rolls fromthose to which the main driving gears are connected.

The modified construction illustrated in vFig correspondsto that portionof the machine illustrated in Fig. 2;' That is, Figs.

1 and 4,'taken to ether, showvthe complete modified form org themachine. The construction illustrated in Fig. 4 is somewhat `simpler andI regard it as more advantageous. The frame shown in Fig. 4 is made as@a casting of sufficient trength, and it has a straight upper sur acewhich can be machined and which serves as the support for the otherparts of the machine. This construction of the frame avoids the steppedconstruction of Fig.' 2, and provides added strength.

Certain of the parts of Fig. 4, which are similar to those of Fig.` 2,are indicated bythe same reference characters with suffixes appendedthereto. Thus there are provided, 1n the'construction` of Fig. 4, twosets of press rolls 'arranged and adapted to act upon the pulpsuccessively. The -firstset of press rolls 17, 18, has the upper rollarranged with its center somewhat,l back of the center ofthe lower roll,this arrangel ment 'promoting the action' of the rolls in removing waterfrom the pulp. Thejlower roll 18a is supported by suitable bearingscarried by the lower frame. The upper roll 17a is supported in bearings72 which are adjustably carried bythe lframe member 70, the end of thisJframe being secured to the lower frame member by the bar 71. Thus roll17a is forced downward by the spring 73, the tension of which can beincreased or decreased by the screw member 74 having an operating handle75. This arrangement provides for the direct action of the spring uponthe upper roll, which is nevertheless yeldably held against the lowerroll. A cross beam or platform 76 enables the operator to gain' accessto the central portion of the machine. This beam or platform is luitablysupported by the end frame memers. v

The second set of press rolls 42a 43", is similarly arranged with theupperroll olfset, as shown, this arrangement materially promoting thedesired dehydration of the pulp. The lower roll 43a 's supported bysuitable bearings carried b the upper frame members. `The upper roll 42ais held in bearings carried by the pivoted member 77 which is pivotally.supported by the upright frame member 78. The opposite end of the member77 is heldby the rod 79 and the compound levers 80, 81, 82. The rod 79is adjustable by means of a nut screwthreaded upon its upper end andadapted to be operated by the wrench or operating handle 84, while thepressure applied to the roll can be increased or decreased by moving theweight 83 upon the lower lever 82. The rod 84 and hand wheel l85 enablethe roll 42a to be raised, when thisl isdesired. In order to raise theroll, the weight 83 is removed or the pressure on the left-hand end ofthe member 77 is released, and the 'hand wheel 85 is then screwed downtothe desired extent. f.

The felt which supports the pulp web passes between the first set ofpress rolls l17, 18a, and thence over the idlers 19a and l19", fromwhich it returns around the idler .t

2()EL in a manner similar to that above described in connection withFig. 2. After leaving thev lower carrying felt, the pulp web passes tothe second set of press rolls 42a, 43a. If the felt does not approachnear enough to these rolls, a table 41a can be interposed for assistingin guiding the web from the felt to the press rolls; This table 41a maybe of varying width, or it may be omitted altogether where thearrangement of the felts lis such as to discharge the web directlybetween the press rolls.

The second set of press rolls, as previously described in connectionwith Fig. 2, is operated at a somewhat increased speed as compared withthe first set of press discharge belts 88.

rolls, so that the pulp web is separated into sheets along the weakenedtransverse portions thereof. These separated" sheets are then passedbetween the second set of press rolls where they are further dehydrated,and the dehydrated sheets are then discharged from the machine.

The discharge mechanism shown in Fig. 4 is of an automatic character andis intended to discharge the separated sheets with a -minimum of manuallabor into a suitable receptacle therefor. This discharge mechanism ismade up of the two rolls 86 and 87, suitably supported,.and having thetwo felts 88 carried thereby. The-roll 86 is supported in suitablebearings in the uprlght frame member 78, While the roll 87 is adjustablysupported by members 89 and 91. The distance between these members canbe varied, andthe roll 87 can be raised or lowered by means of theadjustable member 89 which has a slotted portion in which the bolt 90operates. The roll 86 is driven by a crossed belt or chain from a pulleyor sprocket 53 and which acts upon a similarpulley or sprocket 86". Thesize of the pulley or sprocket 86 with respect to the pulley or sprocket53b is such that the belts 88v are speeded up and run much faster thanthe pulp web passing through. the machine. These belts pick up theseparated sheets and discharge them at an increased velocity into asuitable receptacle 92 therefor. Thigreceptacle Fmay be convenientlyarranged below the belts 88 so that the discharged sheets will fall intoit by gravity, or by the combined actionlof gravity and of the impetusgiven to the sheets by the rapidly moving From Fig. 5 it will be notedthat the two y belts 88 are separated a somewhat greater distance at4their outer ends than at their inner ends. This is due to theconstruction'of the rolls 86 and 87 with a slight taper toward or awayfrom the center, as shown. This Yarrangement promotes the separation ofthe sheets from each otheralong the median line into which the p p webis cut by a water jet (shown at 102, Fig. 1, and to be described later)at the time of its formation. The two halves of theweb sheets aretherefore separately discharged at the same time by the two belts 88.` fThe two press rolls 12a and 43% are provided with doctors of improvedconstruction. The lower doctor 97 is supported at its ends byprojections 96 carried by the upright frame members 78, such projectionsthrough which passes bolt 100 for securing the doctor in place.l Inorder to strengthen the doctor longitudinally it has secured thereto an.angle iron member 98. l

The upper doctor 94 is similarly adjustable upon and carried by asupporting and guidemember or projection 93 being held in adjustedpositionby means of bolt 101 and it likewise has a stifl'ening angleiron 95 secured to its upper surface. The two doctors are adjustabletoward and away from the rolls and can be held in adjusted position.They are of simple construction but nevertheless effective for theirintended purpose of preventing the sheets from following either of thepress rolls and for guiding the sheets on to the delivery belts 88.

The preferred construction of the screen cylinder is illustrated indetail in Figs. 7, 8 and v9. As thus illustrated, the shaft 57 of thecylinder is provided with a plurality of spiders including two similarend spiders 58 and a number of intermediate spiders 59, all beingsecured to the shaft by means of setscrews or other suitable fasteningmeans. The spiders are secured togetherA by aplurality of tie-rods 60.

Around the peripheri'es of the spiders 59 are a plurality of rods 61,preferably round, and laid ingrooves provided for their reception. asindicated in Figs. 8 and 9. The

end spiders 58 are slightly larger in diameshows one of these rods 62,as substantially square in cross-section. In Fig. 1, five such rods 62are shown, these being spaced apart at equal distances around thecylinder. Upon the rods 61 and 62 there is wound a wire of suitablesize, as illustrated in Fig. 7 and upon this wire are arranged thescreen fabrics of appropriate mesh.

. In the operation of the screen cylinder the pulp in the vat 7 is takenup upon the surface of the cylinder ina relatively thin layer, which maybe regulated in the manner above referred to. The layer of pulpoverlying the relatively large rods 62, are thinner than the otherportions of the web because the pulp fibers do not build up. so rapidlyon these portions of the cylinders` surface. Accordingly, the continuousweb formed upon the cylinder is weakened along transverse linescorresponding with the positions of the rods 62. It will be evident thatthe size of the sheets will be determined by the distance apart of theserods, and that the size of the'sheet. can be regulated by .varying thepositions of these rods on the cylinder. It will also be evident thatthe outer surface of the screen cylinderv is continuous and free fromobstruction and from any projections. That is, the weakened portions ofthe webV are formed by positioning the rods 62 withinthe effectivescreen fabric` instead of by arranging projections outside the screenfabric.

The web is weakened longitudinally by means` of a water jetwhich playsat '102 against the pulp as it is carried on felt 9v around roll 11. Thewater is supplied through a main pipe 103, which lies transversely o fthe vat 7, and a branch pipe 104.

After the web has been formed upon the .screen/cylinder it is thenpassed between slight projections corresponding to the grooves upon thecorrugated rollers. The pulp sheets will thus have a distinctiveappearance.y l

Instead of forming a continuous web upon the screen cylinder and passingthis web through the machine, separate sheets maybe formed which aresubstantially unconnected. It will be evident that the thickness of theweb along the lines where it is weakened is dependent upon theeffective` width of the bars 62. The width of these bars may beincreased to such'an extent that the bers of the pulpwill not build upthereon to any appreciable extent, .in which case the web so 'which thesheet of pulp is passed, with will be formed of substantially se aratesheets rather than as a continuous we the length of the sheets being thecircumferential distance between adjacent bars 62. ln

Fig. 8 bars 62A are shown of a width adapted for this purpose.

From the preceding description, taken together with the illustration, itwill be seen that the present invention provides an improved machine ofthe character described having two successive sets of rolls betweensuccessive removal therefrom of increased amounts of waten It will alsobe seen that the pulp, but not the felt, is passed between the secondset -of rolls which are adapted to subject it to a greater pressure thanthe felt could safely stand without injury.I While the second 'sety ofrolls is illustrated as a grooved set of rolls, it will be understoodthat the rolls may be otherwise constructed Ito insure that the sheet orweb of pulp will be positively drawn between the rolls andthere-subjected to compressionand dehydration. It will also be seen thatthe sheet of pulp is suitably guided and conveyed from pleasing and thefirst set of rolls lto the second set, for ex! ample, by passing it overa horizontal or inclined table, which table, however, may be done awaywith if the web or layer is otherwise suitably guided and conveyed. Soalso, while the second set of rolls is shown as having the groovedportions thereof 'separated a distance less than the thickness of thesheet or web, this separation is not essential provided the rolls are soconstructed as to insure the 4positive passage of the web therebetween,although the spacing apart of the grooved rolls is an advantageousconstruction.

I claim :l

l. A pulp machine comprising means for forming a pulp web, a felt forcarrying the web, a set of press rolls between whichboth the web andfelt pass, and a second set of press lrolls arranged beyond the firstbetween which only the web passes, said sets of press rolls beingconstructed and arranged to subject the web to a heavy pressure toremove water therefrom.

2. A pulp machine comprising means for forS-ming a pulp web withtransverse weakened portions therein at intervals, a felt for carryingthe web, a set of press rolls between which both the web and felt pass,and a second set of press rolls arranged beyond the first and arrangedto be rotated at a greater peripheral speed than the first, said sets ofpress rolls being constructedand arranged to subject the web to a heavypressure to ren move water therefrom.

3. A pulp machine comprising means for 4 forming a pulp web withtransverse weakened portions therein at intervals, a felt for carryingthe web, a set of press rolls between which both the web and felt pass,and a second set of corrugated press rolls arranged beyond the first andbetween which only the web passes, said second set of press rolls beingarranged to be rotated at a greater peripheral speed than the first, andboth sets E of press'rolls being constructed and arranged to subject theweb to a heavy pressure to remove water therefrom. A

4. A pulp machine comprising means\for forming a pulp web withtransverse weak- 'cylinder for forming a pulp web and means forsubjecting the web so formed to pressure to remove water therefrom,saidscreen cylinder having a screen periphery and having relativelylarge bars within and adjacent to the screen periphery and spaced apartto -sheets along the weakened transverse porform weakened transverseportions in the tions, and delivery means for the sheets esweb. capingfrom the second set 'of press rolls, said 6. A pulp machine comprisingmeans for delivery means being arranged to receive the forming a pulpweb and means for subjectseparate sheets of pulp and traveling at a ingthe web so formed to pressure to remove suiiiciently rapid rate todischarge the sheets water therefrom, said means including a set into areceptacle therefor.

of corrugated press rolls having symmetri- 12. A pulp machine'comprising means for cally disposed sets of helical grooves conforming apulp web with transverse weakstructed /andadapted to engage the pulpened portions therein at intervals, two sets of positively and draw ittherebetween and to press rolls between which the web is suci subject itto a heavy pressure rto remove cessively passed and subjected to a heavywater therefrom.

. pressure to lremove water therefrom, the

7 A pulp machine having a set of press second set of ress rolls beingrotated at a rolls which normally bear upon each other .greater periperal speed than the first only at their ends' and have their centralporwhereby the web is broken into usheets along tions spaced apartadistance less than the the weakened transverse portions, anddelivthickness of the pulp web to be subjected ery means arranged toreceive the sheets to pressure therebetween,` whereby the cenfrom thesecond set of rolls and*A to discharge tral 4portionsof the roll bearupon the pulp them into a receptacle therefor, said delivery vweb Whileit is passing therebetween, but the mea-ns comprising one or moretraveling belts rolls bear upon each other at their ends when w adaptedto travel at a materially increased no pulp web or sheet is passingtherebetween. speed as compared with the peripheral speed 8. A pulpmachine having al set of press of the rolls, and being adjustable todisrolls having symmetrically disposed sets of charge the sheetsintoareceptacle at differhelical grooves therein and forming corrugalAent levels. tions for assisting the passage of the pulp f 13. A pulpmachine comprising means web or sheet therebetween. for forming a pulpweb with transverse 9. A pulp machine comprising means for weakenedportions therein at intervals and forming a pulp web, a set of pressrolls befor cutting or dividing said web longitutween which the web ispassed and subjected dinally into two parts, two sets of press to aheavy. pressure, a second set of press rolls between whichthe two halvesof the rolls arranged beyond the first for subjecting web are passedsuccessively and subjected' the web to aheavy pressure, and a stationaryto a heavy pressure, the second set o f press table arranged betweensaid sets of rolls `for rolls being rotated at a greater peripheralsupporting the web in its passage from the speed than the first, wherebythe two halves first set to the second set. .of the web are broken intosheets along 10. A pulp machine comprising means forfthe weakenedtransverse portions, and deforming a pulp`web,a felt for carrying thelivery means for delivering the separate web, a set of press rollsbetween which both .sheets -thus formed, said delivery means 1nthe weband vfelt pass and between which cluding two belts each ada ted toreceive the web is subjected to a heavy pressure, a and separatelydischarge t e sheets from second set of press rolls arranged beyond theeach half of the pulp web. first and arranged tobe rotated at a greater14. A pulp machine comprising means for peripheral speed than the firstand to sub- OI'minga Web Wlth a 10I1gltlld1na1 Welkelled ject the web toa heavy pressure, and a table portion therein, press rolls betweenwhichthe interposed between the two sets' of rolls for web is passed anddelivery means which eX- supporting the web and sheets v separated ertatransverse pull upon the'web and septherefroni during their passage fromthe first arate. it along the longitudinal weakened set of rolls to theseco'nd. portion.

11. A pulp machine comprising means for 15. A pulp machine comprisingmeans for forming a pulp webL with transverse weakforming ay web with alongitudinal weakened ened portions therein at intervals, a set ofportion therein, press rolls between `which press rolls between whichthe web is passed the web is passed and delivery means which andsubjected to a heavy pressure, a second exert a transverse pull u ponthe web and set of press rolls arranged beyond the first separate italong the longitudinal weakened for subjecting the web to aheavypressure, -,portion, said delrvery means comprising said second setof press rolls being adapted two diverging belts.

to be rotated ata greater peripheral speed In testimony whereof l afiixmy si nature. than the first, whereby the web is broken into HARRY E.TIDM SH.

